"Start" and "exit" buttons are not working properly in blender game
Mouse over text does not work, instead use a plane invible and parent it to the text (child), to make parent use Alt+P.



The plane needs to be an actor to be detected.



Use the logic on the planes:



And to change the color use cont.owner.children[0].color = [1,1,1,true].

When you use module execution mode it pass the controller to the function.

#Note that there is no imports

def start(cont):
    l_click = cont.sensors['MouseStart']
    m_over = cont.sensors['MouseStart1']
    game_actuator = cont.actuators['startGame']
    if l_click.positive and m_over.hitObject:
        cont.activate(game_actuator)

def exit(cont):
    l_click = cont.sensors['MouseExit']
    m_over = cont.sensors['MouseExit1']
    game_actuator = cont.actuators['Game']
    if l_click.positive and m_over.hitObject:
        cont.activate(game_actuator)